The USGenWeb projects are over twenty years old and, as a result, a lot of the contact information for older submissions is out-dated.
Generally speaking, especially with Query or Surname research submissions, we have no way of updating the email addresses because we can't contact those people, either! But, you never know! Send an email to Kris. It's sometimes the case that a new email address has been sent in, but hasn't been updated on every page in which it appears.
Additionally, if YOUR email address has changed, let us know so people can find you.